Fornia



A. F. BROWN JAR DOWN SPEAK March 25, 1.930.

Filed Dec. 17; 192'/ Patented Mar. 25, 1930.

ALVIS F. BROWN, OF WHITTIER, CALIFORNIA, ASSIGNOR TO BAASE-ROSS TOOL COM- PANY, INCORPORATED, OII LOS ANGELES, CALIFORNIA, A CORPORATION OF CALI- FORNIA .TAR-DOWN SPEAR Application led December 17, 1927. ySerial No. 240,745.

This invention has to do with a well tool and has particular reference to a tool of the type known generally as a jar down spear.

It is a general object of this invention to provide a simple, reliable and effective tool of this character.

In the course of drilling deep wells, for instance, oil wells, it is at'times desirable to jar or drive a casing downwardly in the well by l@ jarring it or driving it at a point located in the well.

Itis a general object of this invention to provide a jar-down spear of the character mentioned that can be freely lowered into a well casing, or the like, and released at the desired point to engage or grip -the casing so that it can be eectively j arred downwardly.

It is another object of this invention to r provide a jarring tool of the character men- 315 tioned which is simple to control and reliable in operation. j

The various objects and features of my invention will be best and more fully understood from the following detailed descrip- "'r' tion of a typical form and application of the invention, throughout which description I refer to the accompanying drawings, in which:

Fig. 1 is a view showing the tool provided by this invention in position to be lowered 39 into a well casing, parts of the tool being broken away to show insection; and

Fig. 2 is al view similar to Fig. 1 showing the tool set or in operating position so that it rips the casing.

rIhe tool provided by. this invention includes, generally, a body 10, slips 11 carried by the body to be operable into engagement with the interior of a well casing C, a stem I 12 carried by the body and projecting downh wardly therefrom, an operating'V connection l13 between the stem 12 and the slips 11, a tail piece 14 carried by the stem below the body, means 15 operable to releasably hold the tail pieceA out of operation with reference to the stem, and means 16 for operatively connecting the tail piece and stem.

The upper end portion of the body 10 is provided with inclined faces 17 to carry the slips 11. In the particular constructlon shown, there are two upwardly and outward- Voperating member such, for instance, as a string of drill pipe, or the like. In the drawinOs I have shown the body provided at its .upper end with a standard form of tapered screwthreaded pin projection 19. f

The slips'll arev slidably carriedjon the inclined faces 17 of the body and are operable between a `down position where they are free of the casing C and an up position where they are out and in engagement with the casing C. 'Ihe slips are shown in the down position in 1 and in the up position in Fig. 2. In accordance with standard practice, the outer faces of the slips are provided with gripping teeth 2O to engage the interior of the casing. The teeth 20 are faced downwardly.

lThe stem 12 is provided to carry the tail piece and to form an operating connection between the tail piece and slips through the means 13. The upper end of the stem 12 slidably fits into a'socket 22 extending upwardly into the body from its lower end. The stem is retainedin position with referencefto the body by a transverse pin 23 carried by the upper end of the stem to project laterally from the stem through vertical slots 24 pro- -vided in the lower portion ,of the body 10.

The slots 24 are made suihciently long to allowl the desired movement of the stem with reference to the body. The stem 12 extends a substantial distancebeyond the lower end of the body and is provided at its lower end with a stop 25.- Y

, The means 13 provided for operatively connecting the stem 12 and slips 11 may in. clude any suitable connection between these parts whereby the slips are connected with the stem to be moved with the stem. In the construction shown in the drawings, the means 13 includes a sleeve 27 slidably carried on the lower portion of the body and links 28 connecting the sleeve with the slips. The links are pivotally connected to the sleeve and also to the slips to allow the slips toy move outwardly relative to the sleeve between the lill) j 27 in the down position, or the slots 24 may be proportioned so that the pin 23 engages their lower ends to stop the sleeve in the down position.

The tail piece 14 may be of the general construction commonly found in tools of this general character; for instance, it may include. an upper collar 40 slidably carried on the stem 13, a lower collar 41 slidably carried on the stem 12, and a plurality of springs 42 connected to and extending to the collars and shapedto normally bear outwardly to be in frictional engagement with the interior of the casing C. The tail piece 14 and the stem l2 are, relatively movable between the unactuated position of parts shown in Fig. 1 and the set position shown in Fig. 2. It is to be noted that in Fig. 1 the tail piece is in an up position on the stem with its upper collar 4()V in engagement with the lower end of the body l0, while in the position shown in. Fig. 2, the tail piece is at the lower end of the stem and is spaced below the lower end of the body.

. The means 15 is provided to releasably hold the stem and tail piece in the unactuated position, as disclosed in Fig. 1, and may-,include a latch 45 mounted in a recess 46 formed longitudinally in the stem. A pivot pin 47 pivotally connects the lower end of the latch and the stem 12 while a spring 48 normally urges the upper end portion of the latch outwardly to yieldingly hold it in the operating position shown in Fig. 1. The upper or outer end portion of the latch 45 is provided with an upwardly facing shoulder 50 adapted to engage under the lower end of the-body 10, as shown in Fig. 1, to hold the stem 12 in the down position with reference to the body. A. recess 51 is provided in the outer edge of the latch 45 to receive the top collar 40 of the tail piece when the shoulder 50 is engaged under the lower end of the body 10. The recess 51 is designed to release the collar 40 of the tail piece upon up pull being put. upon the stem 1-2. From inspection of the drawings, it will be seen that the recess is beveled so. that the latch is depressed upon the stem being pulled upwardly with reference to the tail piece.

rlhe means 16 operates tofset or operatively connect the tail piece andy stem in operating positions, as shown Fig. 2. The mea-nsl may include a latch mounted in a recess 61 formed longitudinally in the lower portion of the stem 12. rlhe upper end portion of the latch is pivotally held in the recess by pivot pin 62 anda spring 63 is provided in connection with the lower or projecting end portion of the latch to normally urge the latch outwardly. The latch 6() has a downwardly facing shoulder 64 adapted to engage lover the lower collar 41 of the tail piece to hold the tail piece in the down position with reference to the stem, as shown i-n Fig. 2. The latch 60 allows the collar 41 to be freely passed downwardly to the position shown in Fig. 2, but prevents i-t from moving upwardly from the position show-n in Fig. 2..

In operation, the tool is lowered into the well casing C with the parts in the unactuated position, as shown in Fig. 1. case, the latch 45 holds the stem 12 in a down position with reference to the body 10, causing the slips 11 connected to the stem through the means 13 to be heldv in the vdown or retracted position. The latch also holdsv the 4tail piece iny an up position on the stem 12 parts thus set or arranged, the body 10 di- Y rectly engages the upper end of the tail piece to force the tail downwardly in the casing C to the desired position. TWhen the tool has reachedv the desired point in the casing C, it is set ready for the jarring operation by pulling upwardly on the `body through the operating means connected to the body by means of the pin 19. This upward pull on the body causes the stem 12I to be pulled up.- wardly with reference to the tail piece so that the upper collar 40 of the tail piece, cooperating with the notch in the latch 45,. depresses the latch so that thesoulder 50 of the latch releases: the stem Afrom thevlower end of thebody. This allowsthe stem to move upwardly with reference to the body. Upward movement of the body 10 is continuedA until the stem 12 has beenv moved upwardly with reference to the tail piece until the latch 60 engages over the lowercollar 41 of the tail piece. With the parts thus operated, the tail piece is connected to the stem in the down position shown in F ig. 2, and the top collar 40 of the tail piece holds the latch 45 depressed so that the stem is free to move upwardly in the socket 22 in the body. The body 10 is then moved downwardly, causing the upper end of the stem `to move upwardly in the socket 22 with the result that the sleeve 27 is moved` upwardly on the lower portion of the body and the slips connected with the sleeve through the links 28 are moved upwardly on the inclined faces 17. This operation is continued until the slips have been properly set inl gripping engagement with the interior of the casing C. TVith the parts thus actuated or set,l the tool engages the casing C so that it can be jarred or torced downwardly. To release the tool after the desired jarring operation Ahas been completed, the body 10 is pulled upwardly withdrawing it from between the slips so that the slips and stem return to the unactuated position shown in Fig. l with the tail piece at the lower end ot the stem to be withdrawnfrom the casing by means of the stem.

Having described only a typical preferred form of my invention, l do not wish to limit myself to the specific details set forth, but wish to reserve to myself any changes or variations that may appear to those skilled in the art or fall within the scope of the `following claims.

Having described my invention, l claim:

1. A tool for operation in a Well casing including, a body, means carried by the body for engaging the casing, a tail piece, a stem movable relative to the body to actuate said means, the stem carrying the tail piece and being operatively connected with said means, and a latch releasably holding the stem against operation relative to the body.

2. A tool for operation in a well casing including, a body, means carried by the body Jfor engaging the casing,a stem carried by the body for movement relative to the body and operatively connected with'said means to actuate said means when moved relative to the body, a tail piece slidably carried onY the stem, means for releasably holding the stem against movement relative to the body, and means operatively connecting the stem and tail piece.

3. A tool for operation in a well-casing including, a body, means carried by the body for engaging the casing, a stem carried by the body for movement relative tothe body and operatively connected with said means to actuate said means when moved relative to the body, a tail piece slidably carried on the stem, a latch for releasably holding the vstem against movement relative to the body, and means operatively connecting the stem and tail piece.

4C. A tool for operation in a well casing including, a body, means carried by the body for engaging the casing, a stem carried by the body for movement relative to the body and operatively connected with said means to actuate said means when moved relative. to the body, a tail piece slidably carried on the stem, a latch for releasably holding the stem against movement relative to the body, and a latch operatively connecting the stem and tail piece.

5. A tool for operation in a well casing including, a body, means carried by the body for engaging the casing, a stem carried by the body formovement relative to the body and operatively connected with said means` to actuate said means when moved relative to the body, a tail piece slidably carried on the stem, a latch for releasably holding the stein against movement relatively to the body, the latch being released by upward movement of the stem with reference to the tail piece, and means whereby the stein isvoperable by the tail piece.

6. A vtool for operation in a well casing including, a body, means carried by the body for engaging the casing, a stem carried by the body for movement relative to the body and operatively connected with said means to actuate said means when moved relative to the body, a tail piece slidably carried on the stem, and a single member for releasably holding the stem against movement relative to the body and the tail piece in an up position on the stem.

7. A tool for operation in a well casing including, a body, means carried by the body for engaging the casing, a stem carried by the body for movement relative to the body and operatively connected with said means to actuate said means when moved relative to the body, a tail piece slidably carried on the stem, a single member for releasably holding the stem against movement relative to the body and Jfor holding the tail piece in an up position on the stem, and means for holding the tail piece at the lower end of the stem upon the tail piece being moved thereto.

8. A tool for operation in a well casing including, a body, means carried by the body for engaging the casing,a stem carried by the body for movement relative to the body and operatively connected with said means, a ytail piece slidably carried on the stem, and a single latch for releasably holding the stem against movement relative to the body and for holding the tail piece in an up position on the stem.

9. A tool for operation in a well casing including, a body, means carried by the body for engaging the casing, a stem carried by the body for movement relative to the body and operatively connected with said means, a tail piece slidably carried on the stem, a single member for releasably holding the stem against movement relative to the body and for holding the tail piece in an up position on the stem, and a latch for holding the tail piece at the lower end of the stem upon the tail piece being moved thereto.

10. A tool for operation in a well casing including, a body, slips carried by the body operable to engage a casing, a sleeve slidably carried by the body and operatively connected with the slips, a stop on the body to stop the sleeve in its unactuated position, a stem carried by the body for movement relative to the body, means operatively connecting the stem and sleeve, a tail piece slidably carried on the stem, a single latch for releasably holding the tail piece in an up position on the stein and for holding the stem against movement relative to the body, and a latch 

